On-Board Diagnostic System

Note: If trouble with any of the following major sensors is detected by the on-board diagnostic system, the ECM will use the following set of defaults.

Volume Air Flow Sensor Fault
The injector's basic drive timing and basic ignition timing are read in from the preset map using the throttle position sensor (TPS) signal and engine revolution speed signal (crankshaft position sensor signal).

Intake Air Temperature Sensor Fault
The control is executed with the suction air temperature regarded as 25°C (77°F).

Throttle Position Sensor (TPS) Fault
The fuel injection rate is not increased for acceleration according to the throttle position sensor signal.

Idle Control Motor Position Sensor Fault
After the idle speed control motor plunger is driven and contracted, the idle revolution speed is not controlled.

Coolant Temperature Sensor Fault
The control is executed with the coolant temperature regarded as 80°C (176°F). (Even if the sensor signal becomes normal again, the control is continued until the ignition switch is turned off.)

Camshaft Position Sensor Fault
Simultaneous injection of fuel is executed for all cylinders. (In this case, the No.1 cylinder top dead center is not detected at all after the ignition key is turned on.)

Barometric Pressure Sensor Fault
The control is executed with the pressure regarded as 101 kPa (760 mmHg, 14.7 psi).

Oxygen Sensor Fault
Closed loop control of the air/fuel mixture ratio is not executed.